 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
RT9199GSP Datasheet(PDF) 9 Page - Richtek Technology Corporation |
|
||||||||||||||||||||||||||||||
RT9199GSP Datasheet(HTML) 9 Page - Richtek Technology Corporation |
|
|
9 / 13 page  RT9199 9 DS9199-07 September 2007 www.richtek.com General Regulator The RT9199 could also serves as a general linear regulator. The RT9199 accepts an external reference voltage at REFEN pin and provides output voltage regulated to this reference voltage as shown in Figure 6, where VOUT = VREFEN x R2/(R1+R2) As other linear regulator, dropout voltage and thermal issue should be specially considered. Figure 7 shows the RDS(ON) over temperature of RT9199. The minimum dropout voltage could be obtained by the product of RDS(ON) and output current. For thermal consideration, please refer to the relative sections. Application Information Consideration while designing the resistance of voltage divider Refer to the “Typical Application Circuit”.Make sure the current sinking capability of pull-down NMOS is enough for the chosen voltage divider to pull-down the voltage at REFEN pin below 0.15V to shutdown the device. In addition, the capacitor CSS and voltage divider form the low-pass filter. There are two reasons doing this design; one is for output voltage soft-start while another is for noise immunity. How to reduce power dissipation on Notebook PC or the dual channel DDR SDRAM application? In notebook application, using RichTek's Patent “ Distributed Bus Terminator Topology” with choosing RichTek's product is encouraged. Distributed Bus Terminating Topology R0 R9 R8 R7 R6 R5 R4 R3 R2 R1 R(2N) R(2N+1) RT9199 RT9199 VOUT VOUT REFEN BUS(0) BUS(1) BUS(2) BUS(3) BUS(4) BUS(5) BUS(6) BUS(7) BUS(8) BUS(9) BUS(2N) BUS(2N+1) Terminator Resistor Input Capacitor and Layout Consideration Place the input bypass capacitor as close as possible to the RT9199. A low ESR capacitor larger than 470uF is recommended for the input capacitor. Use short and wide traces to minimize parasitic resistance and inductance. Inappropriate layout may result in large parasitic inductance and cause undesired oscillation between RT9199 and the preceding power converter. Thermal Consideration RT9199 regulators have internal thermal limiting circuitry designed to protect the device during overload conditions. For continued operation, do not exceed absolute maximum operation junction temperature 125 °C. The power dissipation definition in device is: PD = (VIN - VOUT) x IOUT + VIN x IQ Figure 6 VCNTL REFEN GND VIN VOUT RT9199 V REFEN R1 R2 Figure 7 RDS(ON) vs. Temperature 0.28 0.3 0.32 0.34 0.36 0.38 0.4 0.42 0.44 0.46 0.48 -50 -25 0 255075 100 125 Temperature VCNTL = 5V, VREFEN = 1V ( °C) |
Similar Part No. - RT9199GSP |
|
Similar Description - RT9199GSP |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
